<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"
    track-by="$index"></span>
  </div>
</template>

<script type="text/ecmascript-6">
  const LENGTH = 5
  const CLS_ON = 'on'
  const CLS_HALF = 'half'
  const CLS_OFF = 'off'
    export default {
        props: {
          size: {
            type: Number
          },
          score: {
            type: Number
          }
        },
      computed: { // 计算属性
          starType() {
            return 'star-' + this.size
          },
        itemClasses() {
            let result = [] // 最终所有星星存放的数组
            let score = Math.floor(this.score * 2) / 2
            let hasDecimal = score % 1 !== 0 // 小数
            let integer  = Math.floor(score)// 整数
            for (let i = 0; i < integer; i++) {
              result.push(CLS_ON)// 放入全星
            }
            if (hasDecimal) {
              result.push(CLS_HALF)  // 放入半星
            }
            while (result.length < LENGTH) { // 如果全星数量 < 规定长度 就放入空星
              result.push(CLS_OFF)
            }
            console.log(result)
          return result
        }
      }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .star
    font-size: 0
    .star-item
      display: inline-block
      background-repeat: no-repeat
    &.star-48
      .star-item
        width: 20px
        height: 20px
        margin-right: 22px
        background-size: 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')
    &.star-36
      .star-item
        width: 15px
        height: 15px
        margin-right: 6px
        background-size: 15px 15px
        &:last-child
          margin-right: 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')
    &.star-24
      .star-item
        width: 10px
        height: 10px
        margin-right: 3px
        background-size: 10px 10px
        &:last-child
          margin-right: 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')
</style>
